16 Free Tools

RV, Trailer & Boating Calculators

Planning calculators for towing, trailer weights, RV power and water, leveling, boat fuel range, anchoring, hull speed and marina costs.

Trailer Tongue Weight Calculator

Tongue weight target, percent check and tow vehicle payload used, for a loaded trailer

Cargo capacity from GVWR and unloaded weight, less water, propane and gear

Average load per trailer tire after tongue weight, against the sidewall rating

Hours and days of runtime from amp-hours, depth of discharge, load and inverter efficiency

Days until the fresh tank empties and the grey tank fills, from your own daily use

Lift height and block layers to level a camper from its tilt angle and wheel spacing

Range, endurance, miles per gallon and cost per mile from tank size, burn and speed

Rode length to let out for your depth, bow height, tide and scope ratio, with swing radius

Displacement hull speed in knots, mph and km/h from waterline length, with speed/length ratio

Slip cost per month, season or night from a per-foot rate, plus fees and tax

Heaviest trailer you can tow from GCWR, loaded truck weight and tow rating, with a margin check

Payload rating from GVWR and curb weight, less passengers, cargo, accessories and tongue weight

Scale readings checked against front and rear GAWR, GVWR and GCWR, with the margin on each

Minimum hitch class (I to V) from loaded trailer weight, with tongue weight and tow rating checks

New tongue weight from a load's position ahead of or behind the axle, and where to put it for a target percentage

Loaded boat and trailer towing weight from dry weight, engine, fuel, water and gear, against trailer GVWR and tow rating